Variable Modifiers − Auto & Extern

Programming & Data Structures: Auto and extern variable modifiers in C programming.
Topics discussed:
1. Auto modifier.
2. Extern modifier.
3. Extern modifier examples.
4. Procedure to create a project and different files within that project.

Music:
Axol x Alex Skrindo - You [NCS Release]

#CProgrammingByNeso #CProgramming #VariableModifiers

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[atharvanaik]

GCC didn't compile program with auto keyword. It throws error:two or more data types in declaration of 'var'. While, cl(MSVC) printed 0.

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[krutrth]

@2:35 int var; // It is just declared, not defined..

// definition is when you assign memory to it with = operator

[karthikbankapur]

sir I had tried to print output for an integer(not initialized) but instead of printing any random garbage value it prints 0 all the time. why so?

[sayanmondal]

sir extern int a; doesn't work in my code blocks what should I do?
my main.c
#include <stdio.h>

extern int a;
int main()
{
printf("%d", a);
return 0;
}

and my other.c
int a = 56;

[compangit]

I will just leave a comment for myself. Feel free to comment, thanks. Global variables are initialized to 0 by default. Extern is short for external. It declares the variable but no definition (though you can also define it), therefore no memory allocated to it. This is used when we want access a variable of the same name but located and defined in the nearest outer scope which can also include other files in the current workspace. It avoids redifinition or having to find another variable name for the same variable. Autos can't be declared multiple times, but externs can be. Declaration then definition. Initialize == define.

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[sriharsha]

sir I had tried to print output for an integer(not initialized) but instead of printing any random garbage value it prints 0 all the time. why this happens ?

[techbeginners]

1:44 sir what is garbage value and how it is printed?

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[ojasvvgupta]

at 9.52 even if we dont write extern in main then also it will print 9 as we have already defined the global variable then why to use extern.